Around the world, トゥエン (Tuyen 
, トゥエン) is a common unisex first name. The first name トゥエン is characteristic of Macao, where it is quite a common epicene name, Vietnam, where it is quite a common mostly masculine, but uncommonly girly name, and Australia, where it is a rare epicene name. Measured by absolute frequency, it most frequently occurs in Vietnam, the United States, and Japan. Also, トゥエン is the last name as well as the forename.